/*
 * Copyright (C) 2008 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package holdtime.xlxc.tools.zxing;

import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.Typeface;
import android.util.AttributeSet;
import android.view.View;

import com.google.zxing.ResultPoint;

import java.util.ArrayList;
import java.util.List;

import holdtime.xlxc.R;
import holdtime.xlxc.tools.zxing.camera.CameraManager;

/**
 * This view is overlaid on top of the camera preview. It adds the viewfinder border_jslc_table and partial
 * transparency outside it, as well as the laser scanner animation and result points.
 *
 * @author dswitkin@google.com (Daniel Switkin)
 */
public final class ViewfinderView extends View {

    private static final int[] SCANNER_ALPHA = {0, 64, 128, 192, 255, 192, 128, 64};
    private static final long ANIMATION_DELAY = 10L;//80L;
    private static final int CURRENT_POINT_OPACITY = 0xA0;
    private static final int OPAQUE = 0xFF;
    private static final int MAX_RESULT_POINTS = 20;
    //�޸�ȡ������ʽ
    private static final int CORNER_WIDTH = 10;
    /**
     * �����С
     */
    private static final int TEXT_SIZE = 16;
    /**
     * �������ɨ�������ľ���
     */
    private static final int TEXT_PADDING_TOP = 30;
    /**
     * ɨ����е��м��ߵĿ��
     */
    private static final int MIDDLE_LINE_WIDTH = 6;
    /**
     * ɨ����е��м��ߵ���ɨ������ҵļ�϶
     */
    private static final int MIDDLE_LINE_PADDING = 5;
    /**
     * �м�������ÿ��ˢ���ƶ��ľ���
     */
    private static final int SPEEN_DISTANCE = 5;
    /**
     * �ֻ�����Ļ�ܶ�
     */
    private static float density;
    private final Paint paint;
    private final int maskColor;
    private final int resultColor;
    private final int frameColor;
    private final int laserColor;
    private final int resultPointColor;
    boolean isFirst;
    private Bitmap resultBitmap;
    private int scannerAlpha;
    private List<ResultPoint> possibleResultPoints;
    private List<ResultPoint> lastPossibleResultPoints;
    private int ScreenRate;
    /**
     * �м们���ߵ����λ��
     */
    private int slideTop;

    /**
     * �м们���ߵ���׶�λ��
     */
    private int slideBottom;

    // This constructor is used when the class is built from an XML resource.
    public ViewfinderView(Context context, AttributeSet attrs) {
        super(context, attrs);

        density = context.getResources().getDisplayMetrics().density;
        //������ת����dp
        ScreenRate = (int) (20 * density);
        // Initialize these once for performance rather than calling them every time in onDraw().
        paint = new Paint();
        Resources resources = getResources();
        maskColor = resources.getColor(R.color.zxinglib_viewfinder_mask);
        resultColor = resources.getColor(R.color.zxinglib_result_view);
        frameColor = resources.getColor(R.color.zxinglib_viewfinder_frame);
        laserColor = resources.getColor(R.color.zxinglib_viewfinder_laser);
        resultPointColor = resources.getColor(R.color.zxinglib_possible_result_points);
        scannerAlpha = 0;
        possibleResultPoints = new ArrayList<ResultPoint>(5);
        lastPossibleResultPoints = null;
    }

    @Override
    public void onDraw(Canvas canvas) {
        Rect frame = CameraManager.get().getFramingRect();
        if (frame == null) {
            return;
        }

        //��ʼ���м��߻��������ϱߺ����±�
        if (!isFirst) {
            isFirst = true;
            slideTop = frame.top;
            slideBottom = frame.bottom;
        }

        int width = canvas.getWidth();
        int height = canvas.getHeight();

        // Draw the exterior (i.e. outside the framing rect) darkened
        paint.setColor(resultBitmap != null ? resultColor : maskColor);
        canvas.drawRect(0, 0, width, frame.top, paint);
        canvas.drawRect(0, frame.top, frame.left, frame.bottom + 1, paint);
        canvas.drawRect(frame.right + 1, frame.top, width, frame.bottom + 1, paint);
        canvas.drawRect(0, frame.bottom + 1, width, height, paint);

        if (resultBitmap != null) {
            // Draw the opaque result bitmap over the scanning border_jslc_table
            paint.setAlpha(OPAQUE);
            canvas.drawBitmap(resultBitmap, null, frame, paint);
        } else {

            // Draw a two pixel solid black border inside the framing rect
            paint.setColor(frameColor);
            canvas.drawRect(frame.left, frame.top, frame.right + 1, frame.top + 2, paint);
            canvas.drawRect(frame.left, frame.top + 2, frame.left + 2, frame.bottom - 1, paint);
            canvas.drawRect(frame.right - 1, frame.top, frame.right + 1, frame.bottom - 1, paint);
            canvas.drawRect(frame.left, frame.bottom - 1, frame.right + 1, frame.bottom + 1, paint);

            //�Ľ�
            paint.setColor(Color.GREEN);
            canvas.drawRect(frame.left, frame.top, frame.left + ScreenRate,
                    frame.top + CORNER_WIDTH, paint);
            canvas.drawRect(frame.left, frame.top, frame.left + CORNER_WIDTH, frame.top
                    + ScreenRate, paint);
            canvas.drawRect(frame.right - ScreenRate, frame.top, frame.right,
                    frame.top + CORNER_WIDTH, paint);
            canvas.drawRect(frame.right - CORNER_WIDTH, frame.top, frame.right, frame.top
                    + ScreenRate, paint);
            canvas.drawRect(frame.left, frame.bottom - CORNER_WIDTH, frame.left
                    + ScreenRate, frame.bottom, paint);
            canvas.drawRect(frame.left, frame.bottom - ScreenRate,
                    frame.left + CORNER_WIDTH, frame.bottom, paint);
            canvas.drawRect(frame.right - ScreenRate, frame.bottom - CORNER_WIDTH,
                    frame.right, frame.bottom, paint);
            canvas.drawRect(frame.right - CORNER_WIDTH, frame.bottom - ScreenRate,
                    frame.right, frame.bottom, paint);

            //�����м����,ÿ��ˢ�½��棬�м���������ƶ�SPEEN_DISTANCE
            slideTop += SPEEN_DISTANCE;
            if (slideTop >= frame.bottom) {
                slideTop = frame.top;
            }
            canvas.drawRect(frame.left + MIDDLE_LINE_PADDING, slideTop - MIDDLE_LINE_WIDTH / 2,
                    frame.right - MIDDLE_LINE_PADDING, slideTop + MIDDLE_LINE_WIDTH / 2, paint);


            //��ɨ����������
            //paint.setColor(Color.WHITE);
            paint.setColor(getResources().getColor(R.color.zxinglib_status_text));
            paint.setTextSize(TEXT_SIZE * density);
            //paint.setAlpha(0x40);
            paint.setTypeface(Typeface.create("System", Typeface.BOLD));
            canvas.drawText(getResources().getString(R.string.zxinglib_msg_default_status), frame.left, frame.bottom + (float) TEXT_PADDING_TOP * density, paint);

            // Draw a red "laser scanner" line through the middle to show decoding is active
      /*paint.setColor(laserColor);
      paint.setAlpha(SCANNER_ALPHA[scannerAlpha]);
      scannerAlpha = (scannerAlpha + 1) % SCANNER_ALPHA.length;
      int middle = frame.height() / 2 + frame.top;
      canvas.drawRect(frame.left + 2, middle - 1, frame.right - 1, middle + 2, paint);
*/
            Rect previewFrame = CameraManager.get().getFramingRectInPreview();
            float scaleX = frame.width() / (float) previewFrame.width();
            float scaleY = frame.height() / (float) previewFrame.height();

            List<ResultPoint> currentPossible = possibleResultPoints;
            List<ResultPoint> currentLast = lastPossibleResultPoints;
            if (currentPossible.isEmpty()) {
                lastPossibleResultPoints = null;
            } else {
                possibleResultPoints = new ArrayList<ResultPoint>(5);
                lastPossibleResultPoints = currentPossible;
                paint.setAlpha(CURRENT_POINT_OPACITY);
                paint.setColor(resultPointColor);
                synchronized (currentPossible) {
                    for (ResultPoint point : currentPossible) {
                        canvas.drawCircle(frame.left + (int) (point.getX() * scaleX),
                                frame.top + (int) (point.getY() * scaleY),
                                6.0f, paint);
                    }
                }
            }
            if (currentLast != null) {
                paint.setAlpha(CURRENT_POINT_OPACITY / 2);
                paint.setColor(resultPointColor);
                synchronized (currentLast) {
                    for (ResultPoint point : currentLast) {
                        canvas.drawCircle(frame.left + (int) (point.getX() * scaleX),
                                frame.top + (int) (point.getY() * scaleY),
                                3.0f, paint);
                    }
                }
            }

            // Request another update at the animation interval, but only repaint the laser line,
            // not the entire viewfinder mask.
            postInvalidateDelayed(ANIMATION_DELAY, frame.left, frame.top, frame.right, frame.bottom);
        }
    }

    public void drawViewfinder() {
        resultBitmap = null;
        invalidate();
    }

    /**
     * Draw a bitmap with the result points highlighted instead of the live scanning display.
     *
     * @param barcode An image of the decoded barcode.
     */
    public void drawResultBitmap(Bitmap barcode) {
        resultBitmap = barcode;
        invalidate();
    }

    public void addPossibleResultPoint(ResultPoint point) {
        List<ResultPoint> points = possibleResultPoints;
        synchronized (point) {
            points.add(point);
            int size = points.size();
            if (size > MAX_RESULT_POINTS) {
                // trim it
                points.subList(0, size - MAX_RESULT_POINTS / 2).clear();
            }
        }
    }

}
